A new arietellid copepod (Crustacea): Pilarella longicornis, gen. n., sp. n., from the brazilian continental shelf

Alvarez, Maria Paloma Jimenez

doi:10.1590/s0101-81751985000400005

Cited by 2 publications

(4 citation statements)

References 3 publications

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“…The present new species falls within the diagnosis of the monotypic Pilarella ( Alvarez 1985 ) except for the following features: (1) left antennule not reaching the caudal rami; (2) short caudal rami; (3) 6 spines on the maxillular praecoxal arthrite (5 in the previous diagnosis); and (4) 6 setae on the maxillular coxal epipodite (5 in the previous diagnosis). For the differences from other genera, see generic remarks in the present study.…”

Section: Resultssupporting

confidence: 56%

A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae

Komeda¹,

Adachi²,

Ohtsuka³

2021

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A new species of the continental shelf hyperbenthic genus Pilarella is described, the first from the Indo-Pacific. This is the second species of Pilarella known, and the first description of a male in the genus. The new species is easily distinguished from other species of Pilarella (P. longicornis) based on: (1) short caudal rami, approximately 1.5 times longer than wide; (2) 2 setae on the mandibular endopod; (3) 6 setae on the maxillular coxal epipodite; and (4) in the female, a short left antennule reaching the posterior border of the genital double-somite. The new diagnosis of Pilarella differs from Metacalanus in the separation of ancestral segments IX–XII and XIV–XV of the antennule, and the presence of 5–6 setae on the maxillular praecoxal arthrite. Pilarella is also separated from Metacalanalis based on the absence of a seta on the third ancestral segment of the antennary exopod, the symmetry of legs 1–3, the presence of a medial basal seta on the female leg 5, and 2 lateral exopodal spines on the female leg 5. A molecular phylogenetic analysis of some representative genera of the family Arietellidae, including the present new species, recovers two arietellid clades (Metacalanus- and Arietellus-clades) as in previous studies. Dichotomous keys for the genera of Arietellidae and the species of Pilarella are included.

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Section: Resultssupporting

confidence: 56%

A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae

Komeda¹,

Adachi²,

Ohtsuka³

2021

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“…The new genus is similar to the genera Metacalanus Cleve, 1901 and Pilarella Alvarez, 1985, and has mixed features of these two genera. The discriminative features between these are as follows (cf.…”

Section: Remarksmentioning

confidence: 78%

“…The discriminative features between these are as follows (cf. Alvarez 1985;Ohtsuka et al 1994) (Pilarella versus Metacalanus): (1) location and configuration of female gonopores and copulatory pores (medially located and paired versus posteriorly and paired or unpaired); (2) relative length of caudal rami (about five times longer than wide versus at most twice); (3) segmentation and relative length of antennules (21-segmented in both, left antennule reaching beyond urosomal end versus 16-or 18-segmented in left and 18-or 20-segmented in right, left antennule not reaching prosomal end); (4) setal number on the second exopodal segments of antenna (three medial setae on the second segment versus only two); (5) armature of the praecoxal arthrite, coxal endite and endopod of maxillule (formula with 6, 1, 2 versus 0-2, 0-1, 0-1); (6) armature and ornamentation of elements on the maxillary endites (two distinct setae + one rudimentary element on the first praecoxal endite versus one + one). The new genus exhibits symplesiomorphies in (1), (3), (4), (5), and (6) with Pilarella.…”

Section: Remarksmentioning

confidence: 99%

“…The systematics and ecology of these copepods have been studied using specially designed gears or deep-sea research vessels (Bradford 1969;Grice and Hulsemann 1970;Grice 1972;Wishner 1980;Fleminger 1983;Alvarez 1985;Wishner and Gowing 1987;Ohtsuka et al 1991Ohtsuka et al , 1994Ohtsuka et al , 1998Ohtsuka et al , 2003Nishida et al 1999;Ferrari and Markhaseva 2000;Ohtsuka and Boxshall 2004). Considerable attention has been paid to these hyperbenthic copepods with regard to the evolution of copepods, because deep hyperbenthic waters have been suggested to have played an important role as a refuge from anoxia in the mesopelagic zone during the Jurassic and Cretaceous (cf.…”

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confidence: 99%

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Systematics and zoogeography of the deep‐sea hyperbenthic family Arietellidae (Copepoda: Calanoida) collected from the Sulu Sea

Ohtsuka

Nishida

Machida

2005

Journal of Natural History

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A faunistic survey of the deep-sea hyperbenthic copepods in the Sulu Sea, which has a deep basin and is connected via shallow straits with the Pacific and the South China Sea, was carried out in November and December 2002, using beam trawls and a mid-water trawl. Two new genera and four new species of the primitive calanoid family Arietellidae are described. A new genus Metacalanalis shows intermediate characteristics between those of Metacalanus Cleve, 1901 and Pilarella Alvarez, 1985. Another new genus, Protoparamisophria, is closely related to Paramisophria Scott, 1897, but exhibits more plesiomorphic states in the female genital system and appendages. Two new species of the genera Paraugaptiloides Ohtsuka, Roe, 1994 and Sarsarietellus Campaner, 1984 are the second and the third species, respectively, for these genera. This discovery enhances the validity of these rare genera, and sheds light on the geological history of the Sulu Sea and the evolution of the Arietellidae within it.

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A new arietellid copepod (Crustacea): Pilarella longicornis, gen. n., sp. n., from the brazilian continental shelf

Cited by 2 publications

References 3 publications

A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae

A new species of Pilarella (Copepoda, Calanoida, Arietellidae) from the hyperbenthic layer of Japan, with a molecular phylogenetic analysis of some representative genera of the Arietellidae

Systematics and zoogeography of the deep‐sea hyperbenthic family Arietellidae (Copepoda: Calanoida) collected from the Sulu Sea

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